Method of enameling pipe joints



.Fume l0, 1924- T. A. WRY v METHOD 0F ENAMELING PIPE JOINTS Filed oct.1o. 1921 fnl/anta; fro/7705 .7?. Wr

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Patented ,time 10, 1924.

` STATES A 1,497,396 ,PATENT oFFllcE.

THQMAS A. WRY, F LYNN, MASSACHUSETTS.

.METHOD 0F mmLING PIPE 'I'OIN'IS.

Applicationiled October 10, 1921. Serial No. 506,838.

the most difficult things is to obtain joints which are thoroughlyenameled so the continuity of the enameled surfacev is unbroken. This isa thing which is very essential/if the pipe line is to be absolutelyprotected l.throughout its inner surface. The object of my presentinvention is to provide an improved method of enameling the joints of apipe line which is simple to carry out and insures a continuous enameledsurface, and for a consideration of what I believe to be novel and myinvention attention isdirected to the accompanying description and theclaims appended thereto.

. In the drawing, Fig. 1 is a side elevation partly in section showing apipe jointmade in accordance with my invention; and Figs. 2, 3 and 4 areviews illustrating steps in carrying out my invention.

Referring to the drawing 5 indicates a pipe fitting such as an elbow, aT, a Y, or the like and 6 a pipe to be connected thereto, the end of thepipe being threaded on the outside in the usual manner as indicated at 7Now, according to my invention I provide a coupling having threadedopenin s as in dicated at 8 and at the inner en of` the threaded portionI rovide a shoulder 9 of a height approximate y equal to the thicknessof the wall of the pipe 6 so that when the pipe is threaded into thecoupling its inner surface comes iush with the surfaceof the coupling.Or, viewed from another aspect, I take a coupling and counterborejtheopeningsfto a depth equal to that desired for the threadsand then cutthreads on the counterbored portion. I enamel the inside of the pipe 6over its-entire surface and on the end as shown at y10, and enamel theinside offitting 5 including shoulder or shoulders 9 but leave thethreads bare without enamel, as indicated at 11. This is shownparticularly in Fig. 2. This enamelin may be carried out by any suitablemet od. I next place liquid enamel around shoulder 9 and on the end ofpipe 6 or at both places and screw the end of the pipe and the fittintogether until the end of the pipe is space slightly from the shoulder.The liquid enamel I preferably employ is that ordinarily termed vitreousenamel, and it may comprise suitable enamel materials ground togetherland mixed with water. I may employ any of the vitreous enamels such asare commonly used for coating metals with enamel. Formulas for suchenamels ma the Grunwald and Hodgson ii Enameling on Iron and Steel,ublished in ,1909 bly' Charles Griffen and ompany, Limited, xeter St.,Strand, London,.Eng land. To obtain a correct spacing between themvIpreferably screw them together until the end of the 1pe and the shoulderare in engagement an then unscrew them again until the pipe end andshoulder are spaced ook entitled apart the desired distance. For exaple, I

be vfound in Y have found a space of approximately inch between the endof the pipe and the shoulder satisfactory. In Fig. 3 VI have shown pipeend 6 as having liquid enamel 12 on its end and in Fig. 4 I have shownthem screwed together to the desired point. In Fig. 4 it will be notedthat liquid enamel fills the space between the shoulder and the pipe endand is heapedjup more or less outside as indicated at 13. I then let theliquid enamel dry after which the joint is heated by` a torch or othersuitable means to bring the temperature upto the fusing point of theenamel. The enamel is thus fused and runs together so as to produce asmooth evenly covered joint as shown at 14 in Fig. 1.

It will be understood, of course, that instead of applying the liquidenamel prior to screwing the coupling and 'pipe end together, Y yI mayscrewthem to ether first the general character of enamel which may befound suitable for coating pipes, my invention being not so muchconcerned with the specific nature of the material used as with themethod of its use. By' my invention I am enabled to produce joints whichare absolutely tig-ht and over which there, is a smooth, even coatingof' enamel. At the same time the joints are easy to make and there vislittle likelihood that they will be imperfect.

In accordance with the provisions of the patent statutes, I havedescribed the principle of operation of, my invention, to ether with theparticular method which now consider to represent the best manner forcarrying it out, but I desire to have it unenters the other, -whichcomprises providingl one member with a shoulder adjacent which the endof the other member is adapted to lie, fastening the members togetherwith theJ end of the one member spaced from the shoulder, filling enamelinto said space, and then fusing the enamel.

2. The method of forming an enameled joint between two members whichcomprises providing one of said members with a threaded portion and ashoulder and the other with a threaded portion, applying liquid enamelto the members, screwing them together to bring the end of the onemember into spaced relation with the shoulder on the other, drying saidenamel, and then fusing it.

3. The method of forming an enameled joint between two members whichcomprises providing*I one of said members with a threaded portion and ashoulder and the other with a threaded portion, applying of the ipe isspaceda slightly from the shoulder, fil ing such space full of enamel,'and then fusing the enamel.

5. The method of. enameling a joint between a fitting and a ipe endwhich comprises providing the Iittmg at the ends of its threads with ashoulder of substantially the thickness of the pipe end, placing l1 uidenamel on the shoulder, the pipe en or both, screwing the pipe end andttin together to brin the pipe end into space relation to the s oulder,and drying and fusing the liquid enamel.

6. The method of forming an enameled joint between a fitting and a pipeend, which comprises providing the fitting with a shoulder, enamelingthe ttin shoulder, enameling the pipe includin its end surface, fastenmgthe pipe end an litting together with the pipe end spaced from theshpulder and with iquid enamel in said space,` and drying and fusingsaid liquid enamel.

In witness whereof, I have hereunto set my hand this'th day of October,1921.

THOMAS A.

including the

